Removed Genset can't start RV

Thanks for the responses. I know this is reaching but perhaps some more clarification will help. When I removed the Genset the only cables I disconnected were for the Genset starter (Red positive) and the Genset short black Ground wire from the Genset housing to the Frame within the compartment. I also removed the Control box harness wiring that goes back up under the Drivers dash. I cant see how the Generator wiring for the control Box could have affected anything in terms of my ability to start the Engine. My Class A has four (4) House batteries and two (2) Chassis batteries. My battery isolator Switch is currently turned on for both meaning I have a connection to the Chassis Batteries and the House Batteries. Funny thing I cant figure out among everything else is that the Generator also has its own Battery in a separate side compartment which I thought was used to start the Genset. However, when I disconnected the leads to that battery and removed the Genset and experienced the starting problem, I checked to see if the Generator positive had any current on it. to my bewilderment..lol..It did, so it wasn't coming from that battery because I had both leads to it completely disconnected. So that meant I still had 12V coming from either my Chassis or House Batteries causing an incomplete loop? So..., in an effort to remedy that I removed the starter from the old genset, reconnected the positive and the frame ground as well. Thinking it would complete the circuit as it was, but that didn't work. I checked all fuses and they are fine. My next move would be to try and switch the Chassis Battery isolator button on and off to see if the relay in the Intellitec battery Control Box got hung up. I was afraid to do that because I normally keep it on while the RV is connected to shore power. I've had problems with it going back on once I turned it off in the past so I didn't want to introduce another problem at this point. Again, the Chassis Batteries and House batteries are both on now as well as I'm connected to House Power. Unfortunately, I'm not the original owner and because of the age of the RV wiring schematics are non existent at this point. The one that I do have is limited and does not show how the Chassis batteries or House Batteries interact with the Genset.